// test setUnion
const assert = require('assert')
const math = require('../../../src/main')

describe('setUnion', function () {
  it('should return the union of two sets', function () {
    assert.deepEqual(math.setUnion([1, 2], [3, 4]), [1, 2, 3, 4])
    assert.deepEqual(math.setUnion(['a', 'b'], ['c', 'd']), ['a', 'b', 'c', 'd'])
    assert.deepEqual(math.setUnion([], [3, 4]), [3, 4])
    assert.deepEqual(math.setUnion([], []), [])
  })

  it('should return the union of two multisets', function () {
    assert.deepEqual(math.setUnion([1, 1, 2, 3, 4, 4], [1, 2, 3, 4, 4, 4]), [1, 4, 1, 2, 3, 4, 4])
  })

  it('should return the same type of output as the inputs', function () {
    assert.equal(math.typeof(math.setUnion([1, 2, 3], [3, 4, 5])), 'Array')
    assert.equal(math.typeof(math.setUnion(math.matrix([1, 2, 3]), math.matrix([3, 4, 5]))), 'Matrix')
  })

  it('should throw an error in case of invalid number of arguments', function () {
    assert.throws(function () { math.setUnion() }, /TypeError: Too few arguments/)
    assert.throws(function () { math.setUnion([], [], []) }, /TypeError: Too many arguments/)
  })
})